Tire safety-valve.



T.BORKGREN. TIRE SAFETY VALVE. APPLICATION FILED MAR. 20,1914- PatentedJan. '19, 11915 umllpll-ul I ll Illlll Attorn eys;

THEODORE BORKGREN, OF GENESEO, ILLINOIs.

TIRE SAFETY-VALVE.

Specification of Letters Patent.

Patented Jan. 12, 1915.

Application filed March 20, 1914. .Serial No. 826,067.

To all whom it may'ooncern:

Be it known that I, THEODORE BORKGREN, a citizen of the United States,residing at Geneseo, in the county of Henry and State of Illinois, haveinvented a new and useful Tire Safety-Valve, of which the following is aspecification.

Thisinvention relates to improvements 1n tire safety valves.

An object of the present invention is to provide a safety valve fortires which will prevent the presence of undue pressure within the tiresuch as is caused by a heating of the air or through the accidentalinflation of the tire to abnormal pressures.

A. further object is to provide a safety valve especially adapted toengage the nner tube of a tire and to effect an air-tight ]11I1C- turetherewith, and which safety valve may beeasily adjusted by a cap whichin addition to providing for the adjustment of the valve, also housesthe spring and sliding valve member. 1

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, can be made within thescope of what is claimed without departing from the spirit of the invention.

In the drawings accompanying this specification and forming a partthereof, the preferred embodiment of my invention is illustrated, inwhich Figure 1 is a view in elevation of my impro ed valve anddisclosing the same secured to a tire. Fig. 2 is a longitudinalsictional view of the foregoing. Fig. 3 iala cross sectional view takenon the line 3; 3 of Fig. 2.

Referring to the drawings in which sim lar reference numerals designatecorresponding parts throughout the several views, 4 represents a portionof a tire, usually the inner tube. and which is provided with "anaperture 5 leading therethrough and through which my improved valveextends so as to communicate with the interior of the tire. A threadedshank 6 is provided at its extreme end with the flange plate 7 bytherestricted neck 8. An opening 9 extends through the said shank andterminates at its upper extremity in the enlarged chamber or compartment10.

In order to rigidly secure the valve to the tire 4. and at the same timeto effect an airtight union therewith, the washer 11 is provided, andwhich as illustrated in Fig. 3, is provided with the inwardly extendingshoulders 12 which contact with the mutilated or squared portion 13 ofthe threaded shank and thus hold the locking washer against rotation.Washer rigidly against the outer extremity of the tube or tire 4, thenut 14 is threadedly secured upon the shank and bears downward againstthe locking washer, thus rigidly clamping the wall of the tube betweenthe flange plate 7 and the said locking Washer and forcing the edges ofthe aperture 5 into rigid contacting with the side walls of therestricted neck 8.

The end wall 15 of the chamber and which is adjacent the extremity ofthe bore 9 is rounded to form a valve seat for the reception of thevalve head 16 of the valve member 17. The valve member includes therounded head 16-, shank l8 and guide portion 19. The guiding portion 19is made so as to slidably engage the sid walls of the chamber 10 so asto maintain the valve head In order to clamp the locking in properrelation to the valve seat and at the same time allows for theescapementof air through the chamber when the valve head is raised from the seat:The guide member is-provided with the outstanding shoulder 20 upon whichrests a coiled compression spring 21 which exerts a suitablecounter-balancing force upon the valve head, tending to maintain thesame in a closed or seated position. .A cap 22 threadedly engages theshank 6 and houses the compression spring 21 therein and forces the samedown upon the shoulder 20 to thus vary the force exerted upon the valvemember, counter-balancing the force due to the pressure upon the head. Anut 23 is positioned upon the shank and acts in the ca pacity of alocking nut to hold the cap in adjusted positions.

The cap is provided with the aperture 24: extending therethrough andwhich provides suitable exit or outlet for the air when the valve headis forced off of the seat due to abnormal internal tire pressures. Theguide portion 19 of the valve member insures that the proper seatingaction will take place between the valve head 16 and I the Valve seat15, despite any jars or vibrations incident to the traveling of theWheel at high rates of speed and over uneven ground. The shoulder 20 andguide portion 19 of the valve member also prevent to a large extent theaccumulation of any dirt or dust upon the valve seat which Would tend tointerfere With the proper closing of the valve. v

Having thus described my invention, What I claim to be new and original.with me is A device of the class described, comprising an externallythreaded shank, means for rigidly securing the same to a tire tube, saidshank provided with a bore extending therethrough communicating With theinterior of the tire and terminating in an upper enlarged chamber, avalve member disposed in said chamber and comprising a head seating uponthe bottom of said chamber, a restricted shank, and a, guiding portion;the saidgniding portion slidably engaging the sidewalls of the chamber,said guiding portion provided With an outstanding shoul der ext ridingover the upper edge of the said shank, an internally threaded capengaging said shank and a compression spring housed Within said cap,contacting at its upper extremity with said cap and at its lowerextremity with the said guiding portion shoulder.

In testimony that It claim the foregoii'ig as my own, I have heretoyiiixed my Sig nature in the presence of two Witnesses.

THEGDORE BOEKQREN.

.i/Vitnesses J, A. Anniznsori,

W. R. REHERD,

